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Here’s what you need to know about the mix-and-match vaccine strategy.

To ensure access to Covid vaccines, developing countries could make their own.

Mixing and Matching Covid Vaccines

Millions in U.S. aid benefited richer hospitals, a new study shows.

C.D.C. Panel Recommends Covid Booster Shots for Millions of Americans

Parents, Will You Vaccinate Your Children for Covid?

Pfizer says new data show booster shots of its vaccine are highly protective against Covid.